The middle of the seventeenth century was a very exciting time in England. The Cavaliers of King Charles the First were fighting the Roundheads of Oliver Cromwell, and the whole country was divided into King's men and Parliament's men. On the side of Cromwell and the Parliament was Admiral William Penn, who had in 1646 been given command of a squadron of fighting ships with the title of Vice Admiral of Ireland, and who had proved to be an expert navigator and sea-fighter. He had married Margaret Jasper, the daughter of an English merchant who lived in Rotterdam, and when he went to sea, he left his wife and children in the pretty little English village of Wanstead, in the county of Essex. The Admiral's son William was born on October 14, 1644, when four great battles of the English Civil War had already been fought: Edge Hill, Newbury, Nantwich, and Marston Moor. The Roundheads were winning the victories, and these Puritan soldiers, fired with religious zeal, and taking such striking names as "Praise God Barebones" and "Sergeant Hew Agag in Pieces before the Lord," were battering down castles and cathedrals, smashing stained-glass windows and pipe organs, and showing their hatred of nobles and of churchmen in every way they could think of. The wife of Admiral Penn, however, lived quietly in her country home, and by the time William was five years old the Cavaliers had lost the battle of Naseby, had surrendered Bridgewater and Bristol, and King Charles the First had been beheaded. A new England, a Puritan England, had taken the place of the old England, but the boy was too young to understand the difference. He knew that his father was now fighting the Dutch, but he was chiefly interested in the games he played with his schoolmates at Wanstead and with the boys from the neighboring village of Chigwell. Now Admiral Penn had fought on the side of the Roundheads because the English navy had sided with the Parliament, while the English army had largely sided with the king, and not from any real love of Oliver Cromwell and the Puritans. He was indeed a Royalist at heart, and had very little patience with the new religious ideas that were becoming so popular in England. The people in Wanstead, however, were mostly Puritans, and young William, boy though he was, heard so much about their religion that he became a little Puritan like his playmates. Some of the fathers and mothers boasted that they had seen "visions," and soon the children were repeating what their parents said. Strange experiences of that kind were in the air, and so little William Penn, when he was only eleven, claimed that he had himself met with such an adventure, and seen a "vision" too.